Block Side Menu and Drag Handle Hidden When Horizontal Scrollbar Appears

Describe the bug
The Block Side Menu and drag handle become invisible when a horizontal scrollbar appears in the editor. This makes it impossible to access block operations (drag, menu options) when content requires horizontal scrolling.

To Reproduce
1.Open BlockNote example: https://www.blocknotejs.org/examples/basic/minimal
2.Open Chrome DevTools (F12)
In DevTools Console, run:

document.querySelector('.bn-container').style.width = '300px';
Or manually resize the browser window to trigger horizontal scrollbar

4.Try to hover over blocks to see Block Side Menu
5.Observe: Block Side Menu and drag handle are not visible

Misc
This issue was confirmed and reproduced locally by Matthew from the BlockNote team.

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